Two types of fish live in a lake. They are extremely similar in size, shape, and body color so as to be indistinguishable. The two types eat slightly different size prey. To determine if they are different species a researcher should ______.
a. look for more physical difference
b. declare them diferent because of their diets
c. check to see if they interbreed successfully
d. see if they are eaten by different predators
e. look ofr more differences in their behaviors
Answer: c. check to see if they interbreed successfully
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Natural selection involves energetic trade-offs between _____
A) choosing how many offspring to produce over the course of a lifetime and how long to live B) producing large numbers of gametes when employing internal fertilization versus fewer numbers of gametes when employing external fertilization C) the emigration of individuals when they are no longer reproductively capable or committing suicide D) increasing the number of individuals produced during each reproductive episode and a corresponding decrease in parental care E) high survival rates of offspring and the cost of parental care
Direct penetration of which of the following worms results in tissue damage at the site of attachment, blood loss, and an acute gastrointestinal phase demonstrated by an increased eosi-nophilia?
a. Whipworm b. Pinworm c. Threadworm d. Hookworm
Which of the following structures is the location of gas exchange between the inhaled air and the blood?
A) trachea B) bronchioles C) alveoli D) bronchi E) pleura
The phospholipids of membranes are:
A) hydrophilic molecules. B) oils. C) both hydrophilic and hydrophobic molecules. D) hydrophobic molecules.